Abstract: A wind-actuated warning device which mounts onto a vehicle to provide an alert or warning to the operator of a vehicular condition which requires the operator to exert special attention and appropriately respond to the condition. Examples of such conditions include a high profile condition, a roof top carrier or a reminder to deploy landing gear on an aircraft. The warning device has a base member with coupling for mounting the base member onto the vehicle. The warning device further has a cover member pivotally mounted to the base member. The cover member has a frontal and a rearward surface with a warning or other indicator associated with the rearward surface of the cover. The cover is biased against the base, which is overcome by wind loading to pivotally collapse the cover onto the base and provide a substantially flat elevational profile of the warning device on the vehicle.